Air filter unit for use in respirators



FIG. 1 is a top front perspective view of a preferred embodiment of the air filter unit for use in respirators;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image of that shown; and,

FIG. 4 is a bottom plan view.

The pattern of holes has been partially shown in FIGS. 1 and 3 for ease of illustration, it being understood that the broken lines indicate that said pattern of holes is continuous throughout the areas represented. 

The ornamental design for an air filter unit for use in respirators, as shown and described. 